Here you can download a lot of useful plugins and scripts for 3dsmax..
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Clone Modifier Author:iTOO
http://www.itoosoft.com/english/menu.php?id=clone
Bercon Maps Author:Jerry Ylilammi
http://www.ylilammi.com/BerconMaps.shtml
http://www.ylilammi.com/BerconMaps/BerconMaps_16_04_2009.zip
MaxPlugins.de
http://maxplugins.de/
Neon Author:Marc Lorenz
http://www.scriptspot.com/3ds-max/scripts/neon
http://plugins.angstraum.at/neon/index.htm
Proxy Manipulator Author:Philip Taylor
http://www.scriptspot.com/3ds-max/plugins/proxy-manipulator
http://www.maxplugins.de/r2010_files/taylor/ProxyManipulator_32_64.zip
Sim Cloth Author:Vladimir Koylazov
http://www.spot3d.com/simcloth/files/simcloth3.rar
http://www.spot3d.com/simcloth/
VG Plugins
http://www.vg2max.spb.ru/plugins.html
V-Ray Plugins
http://www.chaosgroup.com/forums/vbulletin/showthread.php?48990-Put-additional-tools-in-the-download-section/page2
V-Ray Bercon Balls Author:Jerry Ylilammi
http://www.ylilammi.com/BerconMetaball/BerconMetaball_Source_2010_03_24.7z
V-Ray Fur Styler Author:Vladimir Koylazov
http://www.spot3d.com/vray/misc/vrayfurstyler_vraybump2normal.rar
http://www.chaosgroup.com/forums/vbulletin/showthread.php?43642-VRayFur-styler&highlight=VRayFurStyler
http://www.chaosgroup.com/forums/vbulletin/attachment.php?attachmentid=3133&d=1263221977
V-Ray Stereoscopic Plugin Author:Vladimir Koylazov
http://www.spot3d.com/vray/misc/vraystereoscopic.rar
V-Ray Info Texture Author:Vladimir Koylazov
http://www.spot3d.com/vray/misc/vraysamplerinfotex.rar
egz V-Ray Materials Author: egz
http://www.scriptspot.com/3ds-max/scripts/egzvraymaterials
http://www.vray.info/assets/materials/egzMaterials0.8_for1.5.zip
Blend Image Tool Author:Vladimir Koylazov
http://www.spot3d.com/vray/help/VRayHelp150beta/tools/blendimg.rar
http://www.chaosgroup.com/forums/vbulletin/showthread.php?33500-how-to-use-the-hdr-blending-tool&highlight=blendimg+tool
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Advanced Painter Author:Herman Saksono
http://www.scriptspot.com/3ds-max/scripts/advanced-painter-0
http://www.scriptspot.com/files/advpainter_1.6.0.zip
Circle Array Author:Anubis
http://www.scriptspot.com/3ds-max/scripts/circle-array
http://sites.google.com/site/spot4pal/files-list/3dsmax-lib/CircleArray.ms?attredirects=0
Cocktail Greeble Author:Havard Schei
http://folk.ntnu.no/havardsc/site/wordpress/?page_id=27
http://folk.ntnu.no/havardsc/scripts/cocktail_greeble.ms
DBC PolySelector Author:Hanrui Dabai
http://www.scriptspot.com/3ds-max/scripts/dbc-polyselector-v1-0-rc1
http://www.scriptspot.com/files/DBC_PolySelector.rar
Deconstructor Author:Marc Lorenz
http://www.scriptspot.com/3ds-max/scripts/deconstructor
http://store1.angstraum.at/ml_deconstructor.zip
Flower Creator Author:Havard Schei
http://folk.ntnu.no/havardsc/site/wordpress/?page_id=109
http://folk.ntnu.no/havardsc/scripts/flowercreator.ms
Fracture Voronoi Author:Garp
http://www.scriptspot.com/3ds-max/scripts/fracture-voronoi
http://www.scriptspot.com/files/FractureVoronoi_v1.1.ms
Grid Scatter Author:Andrei Kletskov
http://www.scriptspot.com/3ds-max/scripts/gridscatter
http://andklv2.narod.ru/maxscripts/111_gridScatter_v0.3.ms
Golden Guides Author: Matt Rapelje
http://www.scriptspot.com/3ds-max/scripts/golden-guides
http://www.polyleaf.com/MattRapelje_GoldenGuides.zip
Image Tracer Author:Guillermo M Leal LLaguno
http://www.scriptspot.com/3ds-max/scripts/image-tracer-script
Instance Identical Geometry Author:Anubis
http://www.scriptspot.com/3ds-max/scripts/instance-identical-geometry
http://www.scriptspot.com/files/Instance_Identical_Geometry.ms
Lightning Author:Jerry Ylillami
http://www.ylilammi.com/tools.shtml
http://www.ylilammi.com/Resources/BerconLightning_03.ms
Line per Vertex Author:Garp
http://www.scriptspot.com/3ds-max/scripts/line-per-vertex
http://www.scriptspot.com/files/LinePerVertex.ms
LSSpiroGraph Author:Jeff Hanna
http://www.scriptspot.com/3ds-max/scripts/lsspirograph
http://www.jeff-hanna.com/programs/LSSpiroGraph_132.mzp
Mathsurf Author:Ali Torabi
http://www.scriptspot.com/3ds-max/plugins/mathsurf
http://www.torabiarchitect.com/download/download.php?file=3
Max Retopo Author:Mohab Gamal
http://www.scriptspot.com/3ds-max/scripts/max-retopo
http://www.scriptspot.com/files/Max_Retopo.rar
Mouse Scatter Author:Havard Shei
http://folk.ntnu.no/havardsc/site/wordpress/?page_id=20
http://folk.ntnu.no/havardsc/scripts/faceplace.ms
Obj2Spline Align Author:le1setreter
http://www.scriptspot.com/3ds-max/scripts/obj2spline-align
http://www.le1setreter.de/download/Obj2Spline_Aligner.zip
Paint Proxies Author:Pietro Salerno
http://www.scriptspot.com/3ds-max/scripts/proxypainter-mrproxy-added
http://www.webalice.it/pietro.salerno0/proxypainter.rar
Parallel Polys Author:Garp
http://www.scriptspot.com/3ds-max/scripts/parallel-polys
http://www.scriptspot.com/files/ParallelPolys.ms
Path Node Offset Author:Preeth.P.G.
http://www.scriptspot.com/3ds-max/scripts/path-node-offset
http://www.scriptspot.com/files/PathNodeOffset_0.ms
Procedural Array Author: Markus Boos
http://www.scriptspot.com/3ds-max/scripts/procedural-array
http://www.scriptspot.com/files/r7_procedural_array.ms
pX LocoRandomizer Author:Denys Almaral
http://www.scriptspot.com/3ds-max/scripts/px-locorandomizer
http://www.scriptspot.com/files/pxLocoRandomizer.ms
Randerizer Author: Matt Rapelje
http://www.scriptspot.com/3ds-max/scripts/randerizer
http://www.polyleaf.com/randerizer.zip
Random Selector Author:Matyas Vegh
http://www.scriptspot.com/3ds-max/scripts/random-selector
http://matyrix.com/random_selector_v3.0.mse
Shellhole Author:Havard Shei
http://folk.ntnu.no/havardsc/site/wordpress/?page_id=42
http://folk.ntnu.no/havardsc/scripts/shellhole.ms
Translated Bounding Box Author:Anubis
http://www.scriptspot.com/3ds-max/scripts/translated-bounding-box
http://www.scriptspot.com/files/TranslatedBoundingBox.mcr
Voronoi Cells Author:Yegor Tsyba
http://www.scriptspot.com/3ds-max/scripts/voronoi-cells-0
http://www.shiva3d.net/scripts/Voronoi.mse
V-Ray Mesh Converter Author:Cooper
http://www.scriptspot.com/3ds-max/scripts/smart-vrmesh-converter
http://www.scriptspot.com/files/Cooper-SmartVrmeshConverter_11.mcr
Animation Timer Author:Martin Skinner
http://www.scriptspot.com/3ds-max/scripts/animation-timer-animators-stopwatch
http://www.martinskinner.co.uk/maxscripts/animation_timer.html
Bake Author:John Burnett
http://www.scriptspot.com/3ds-max/scripts/bake
http://www.scriptspot.com/scripts/web_upload/John%20Burnett/Bake.zip
Bake Transform Author:Anubis
http://www.scriptspot.com/3ds-max/scripts/bake-transform
http://www.scriptspot.com/files/u9133/BakeTransform.ms
Keyframe Align Author:Animation109
http://www.scriptspot.com/3ds-max/scripts/keyframe-align
http://www.scriptspot.com/files/alexAnimAlign.mcr
Maxtrix Author:Bobo Petrov
http://www.scriptspot.com/3ds-max/scripts/maxtrix
http://www.scriptspot.com/bobo/mxs4/maxtrix/MAxTRIX_0_2.zip
Reduce Transform Keys Author:Craig Miller
http://www.scriptspot.com/3ds-max/scripts/reduce-transform-keys
http://www.scriptspot.com/files/ReduceKeys-v1.0.ms
Simple Traffic Author:Vugar Naib
http://www.scriptspot.com/3ds-max/scripts/simple-traffic#comment-6681
http://www.scriptspot.com/files/VN_Simple_Traffic_v1_edit2_0.rar
Time Range Manager Author:Lorne Brooks
http://www.scriptspot.com/3ds-max/scripts/time-range-manager-1-5
http://www.scriptspot.com/files/TimeRangeManager1-5.zip
Time Wheely Author:Ofer Zelichover
http://www.scriptspot.com/3ds-max/scripts/time-wheely
http://oferz.com/MaxScripts/timeWheely/timeWheely-v1_81.ms
Active Type Author:Jefferson Lim
http://www.scriptspot.com/3ds-max/scripts/activetype-0-30
http://www.scriptspot.com/files/activeType_0.30.ms
Aespid Tools Author:Ruben Mayor
http://www.aespid.com/web/images/stories/maxscript/ATools1.35.rar
http://www.aespid.com/web/maxscripts.html
After Effects Keyframe Exporter Author: mrFryday
http://www.scriptspot.com/3ds-max/scripts/aftereffects-keyframe-exporter
http://www.scriptspot.com/files/aeExport_v095.ms
After Effects Position Exporter Author:Aaron Dabelow
http://www.scriptspot.com/3ds-max/scripts/after-effects-animated-position-exporter
http://aarondabelow.com/max_scripts/AEX_v1.0.zip
Best Viewport Shading Author:Norman3D
http://www.scriptspot.com/3ds-max/scripts/best-viewport-shading
http://norman3d.com/Scripts/Activate_best_shading.ms
Create Encrypted Scripts Author:Michele Marcelli
http://www.scriptspot.com/3ds-max/scripts/create-encrypting-max-script
http://www.scriptspot.com/files/Create_Encrypting_Script.ms
CLine Pan while Drawing Tool Author:OYH
http://www.scriptspot.com/3ds-max/scripts/cline-2-02
http://www.scriptspot.com/files/CLine2-02.mzp
controllerCentral Author:Martin Breidt
http://www.scriptspot.com/3ds-max/scripts/controllercentral
http://scripts.breidt.net/controllerCentral.zip
Give Me Back My Dialogues Author:Lonerobot
http://www.scriptspot.com/3ds-max/scripts/give-me-back-my-dialogs
http://www.lonerobot.com/dotnetcontrols/windowbox.ms
Image Plane Author:Andy E
http://www.scriptspot.com/3ds-max/scripts/imageplane-v1-5
http://andye.myweb.hinet.net/Scripts/Vertical_Plane_v1.7.ms
Instant Replace Author:Hani Tiby
http://www.scriptspot.com/3ds-max/scripts/instance-replace
http://www.scriptspot.com/scripts/web_upload/Hani%20Tiby/InstanceReplace.zip
JJTools Author:Jim Jagger
http://www.jimjagger.com/Pages/Tools/JJTools_Complete2010.htm
http://www.jimjagger.com/Assets/JJToolsV2010.zip
Lele’s Vray Tools Author:Lele
http://www.scriptspot.com/3ds-max/scripts/leles-vray-tools
http://www.scriptspot.com/lele/Leles_Script_Pack_1.5_SP2_Max_8-9-10.rar
LightTouch Author:Bobo Petrov
http://www.scriptspot.com/bobo/mxs2008/LightTouch/
http://www.scriptspot.com/bobo/mxs2008/LightTouch/LightTouch_052.zip
Modifiers Switch Author:Anubis
http://www.scriptspot.com/3ds-max/scripts/modifiers-switch
http://www.scriptspot.com/files/ModifiersSwitch.ms
Outliner Author:Pier Janssen
http://www.scriptspot.com/3ds-max/scripts/outliner
http://script.threesixty.nl/outliner/get_latest.php?file=outliner
Projector Author: Aeron Miles
http://www.scriptspot.com/3ds-max/scripts/projector
http://go2.wordpress.com/?id=725X1342&site=cgvector.wordpress.com&url=http%3A%2F%2Fwww.scriptspot.com%2Ffiles%2FProjector_v093_b.ms&sref=http%3A%2F%2Fcgvector.wordpress.com%2F2010%2F02%2F24%2Fprojector-v0-9-beta-max-script%2F
Shader Utilities MetaSL Author:Thorsten Hartmann
http://www.scriptspot.com/3ds-max/scripts/shader-utilities-for-3dsmax2011
http://www.infinity-vision.de/ShaderUtilities/download/su_free_3dsmax2011.zip
Solidrocks Author:Jerome Prevost
http://www.scriptspot.com/3ds-max/scripts/solidrocks
http://solidrocks.subburb.com/
Soulburn Scripts Author:Neil Blevins
http://www.scriptspot.com/3ds-max/news/soulburnscripts-updated-sept-18th-2008
http://www.neilblevins.com/soulburnscripts/soulburnscripts.htm
Speedometer Author:Giant
http://www.scriptspot.com/3ds-max/scripts/speedometer-0
http://www.scriptspot.com/files/speedometer.ms
Volume Preview Author:Bobo Petrov
http://www.scriptspot.com/3ds-max/scripts/volumepreview
http://www.4rand.com/scripts/VolumePreview034a.zip
Vray Light Lister Author: Anthony McLin
http://www.scriptspot.com/3ds-max/scripts/light-lister-for-v-ray-advanced-1-50-sp2-sp4a-3dsmax2008-2010-x32×64
http://www.scriptspot.com/files/Macro_LightList_2009-2010_sp4a.rar
vCamhaxor Author:kilad
http://www.scriptspot.com/3ds-max/scripts/vcamhaxor-v1-75
http://sites.google.com/site/haxorkila/kilaD_vCamhaxor1.78.rar?attredirects=0
Viewport Control Author:Othoap
http://www.scriptspot.com/3ds-max/scripts/viewport-control-mini#comment-2965
http://www.othoap.com/_3dscripts/ViewPortConMini.zip
V-Ray Proxy Animation Control Author:Leandro Salerno
http://www.scriptspot.com/3ds-max/scripts/vrayproxy-animation-control-v1-0
http://www.scriptspot.com/files/VrayProxy_Animation_Control.ms
Fume & Flow Floater Author:Johnny Random
http://www.scriptspot.com/3ds-max/scripts/fume-flow-floater
http://4rand.com/scripts/FumeFlowFloater/FumeFlowFloater_06.zip
FumeFX Partitioner Author:Jefferson Lim
http://www.scriptspot.com/3ds-max/scripts/fumefx-partitioner
http://www.scriptspot.com/files/FumeFX_Partitioner_0.10.ms
PFlow Control Author:Johnny Random
http://www.scriptspot.com/3ds-max/scripts/pflow-control
http://www.scriptspot.com/files/pFlowControl_v109.zip
http://www.scriptspot.com/3ds-max/scripts/pflow-particle-count-in-viewport-switcher
Pflow Baker Author:Ofer Zelichover
http://www.scriptspot.com/3ds-max/scripts/pflow-baker#comment-6659
http://www.oferz.com/MaxScripts/PFlowBaker/PFlowBaker-v0_6.ms
PF Channel Info Author:Jefferson Lim
http://www.scriptspot.com/3ds-max/scripts/pf-channel-info
http://www.scriptspot.com/files/PF%20Channel%20Info%200.09.00.ms